I need to create a REST API that runs on IIS and played with WCF Web Api. It seems to be able to do everything I want, in contrast to plain WCF or the now deprecated WCF starter kit. I haven't really tried those, but conneg seems to be hard or impossible, and that's a deal breaker, as conneg is one of the many nice orthogonally designed features of HTTP and hence, REST-on-HTTP, that I intend to fully use to my advantage.
Question: As currently there is only a "Preview 4" version out (April 2011), and I could not find much on when MS expects to release it (except an impression it will be either this year or next year) - Should I use it already?
Especially as the source code is there and I could - worst case - go in and modify and build that myself, it almost feels safe to go production with a - well-tested - preview build.
Some more details: I want to start creating prototypes this week and the REST API will end up on production machines in a matter of a few months (this year). I expect the API to still change a little bit, and checking the activity on codeplex it seems to be under active development, but I'm fine with changing my code alongside those changes.